diff --git a/firmware/common/dir.h b/firmware/common/dir.h
index 0e0dbfb4b5..622af11f6d 100644
--- a/firmware/common/dir.h
+++ b/firmware/common/dir.h
@@ -20,16 +20,26 @@
 #ifndef _DIR_H_
 #define _DIR_H_
 
-typdef struct {
-    int offset;
-} DIR;
-
 struct dirent {
     unsigned char d_name[256];
     int attribute;
     int size;
 };
 
+#ifndef SIMULATOR
+typedef struct {
+    int offset;
+} DIR;
+#else // SIMULATOR
+#ifdef _WIN32
+typedef struct DIRtag
+{
+    struct dirent   fd;
+    intptr_t        handle;
+} DIR;
+#endif //   _WIN32
+#endif // SIMULATOR
+
 extern DIR* opendir(char* name);
 extern int closedir(DIR* dir);
 
diff --git a/firmware/common/file.h b/firmware/common/file.h
index c608fbc6a0..dde78bc17d 100644
--- a/firmware/common/file.h
+++ b/firmware/common/file.h
@@ -32,9 +32,14 @@ extern int read(int fd, void* buf, int count);
 extern int write(int fd, void* buf, int count);
 
 extern int lseek(int fd, int offset, int whence);
-#endif
 
 extern int remove(char* pathname);
 extern int rename(char* oldname, char* newname);
+#else
+#ifdef _WIN32
+#include <io.h>
+#include <stdio.h>
+#endif
+#endif
 
 #endif